C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Idle Speed

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Old Mar 7, 2006 | 10:33 AM
  #1  
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Default Idle Speed

I know this is a dumb question, but what is the normal rpm range a stock '85 automatic should be at idle? I ask because mine runs around 500-650 rpms and that seems really low.
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Old Mar 7, 2006 | 10:40 AM
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no problem
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Old Mar 8, 2006 | 12:51 AM
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sounds about right....

Mo
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Old Mar 8, 2006 | 01:02 AM
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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Originally Posted by 4Ever21
I know this is a dumb question, but what is the normal rpm range a stock '85 automatic should be at idle? I ask because mine runs around 500-650 rpms and that seems really low.
I always try to keep mine at 700-800, particularly for emissions testing.
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Old Mar 8, 2006 | 01:24 AM
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550 RPM in gear should be the factory setting.
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Old Mar 8, 2006 | 01:44 AM
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i've never seen it fall below 560 rpms, so i'm good. I was just asking cause it felt like it was about to die on me when it fell that low. It doesnt do it very often. Thanks guys.
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Old Mar 8, 2006 | 07:05 AM
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You might want to check your IAC pintle and clean it if necessary. Ditto for the throttle body. I make it a point to do this once a year. Really mellows out the base idle.
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